14. The president of a consulting firm analyzed the decisions made about marketing by her clients and concluded that the decisions were correct only about half of the time.

The conclusion above depends on the presupposition that

(A) companies can be successful even when about half of the decisions they make about marketing prove to be wrong

(B) companies hiring her consulting firm make no more incorrect marketing decisions than do companies in general

(C) executives consistently making correct marketing decisions rarely enlist the aid of a consulting firm

(D) marketing decision are just as likely to be correct as they are to be incorrect

(E) it is possible to classify a marketing decision properly as being either right or wrong

答案E,不明白D为什么错

这道题的意思大概说 一个公司总裁认为做市场分析只有一半是正确的 那他的presupposition是什么呢
D说的意思是市场决策的正确和错误的可能性一样  （没那么绝对吧）